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    • Graduate School - MU Theses and Dissertations (MU)
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    • 2008 Dissertations (MU)
    • 2008 MU dissertations - Freely available online
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    Inflammation and hypoxia : novel regulators of mammalian copper homeostasis in macrophages

    White, Carine, 1976-
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    [PDF] Research.pdf (17.77Mb)
    Date
    2008
    Format
    Thesis
    Metadata
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    Abstract
    Copper is an essential cofactor of enzymes involved in a variety of important metabolic processes including ATP production, iron transport, and antioxidant defense. The maintenance of copper homeostasis requires a balance of copper uptake and export, as well as the appropriate partitioning of copper between the cytoplasm, mitochondria and secretory compartments. Although many of the proteins involved in copper homeostasis have been identified, it is unknown whether specific pathophysiological conditions lead to compensatory changes in the intracellular copper distribution. In this study, we identify changes in copper homeostasis in response to pro-inflammatory mediators. We also show a novel role for the copper-transporting ATPase, ATP7A, in the bactericidal activity of RAW264.7 macrophage cell. We also identify striking alterations in copper homeostasis in response to hypoxia in RAW264.7 macrophage cells. In response to hypoxia, we observe a change in the hierarchy of intracellular distribution favoring delivery of copper to ATP7A and to the secretory pathway, as evidenced by enhanced activity of the ferroxidase, ceruloplasmin, and by copper-dependent trafficking of ATP7A in hypoxic macrophages in vitro and in vivo. Our study underscores the potential for pathophysiological conditions to regulate adaptive responses involving altered copper distribution to cuproenzymes.
    URI
    https://hdl.handle.net/10355/6624
    https://doi.org/10.32469/10355/6624
    Degree
    Ph. D.
    Thesis Department
    Nutrition area program (MU)
    Rights
    OpenAccess.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
    Collections
    • 2008 MU dissertations - Freely available online
    • Nutrition and Exercise Physiology electronic theses and dissertations (MU)

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